src/lparser.h

   1 /*
   2 ** $Id: lparser.h,v 1.47 2003/02/11 10:46:24 roberto Exp $
   3 ** Lua Parser
   4 ** See Copyright Notice in lua.h
   5 */
   6
   7 #ifndef lparser_h
   8 #define lparser_h
   9
  10 #include "llimits.h"
  11 #include "lobject.h"
  12 #include "ltable.h"
  13 #include "lzio.h"
  14
  15
  16 /*
  17 ** Expression descriptor
  18 */
  19
  20 typedef enum {
  21   VVOID,        /* no value */
  22   VNIL,
  23   VTRUE,
  24   VFALSE,
  25   VK,           /* info = index of constant in `k' */
  26   VLOCAL,       /* info = local register */
  27   VUPVAL,       /* info = index of upvalue in `upvalues' */
  28   VGLOBAL,      /* info = index of table; aux = index of global name in `k' */
  29   VINDEXED,     /* info = table register; aux = index register (or `k') */
  30   VJMP,         /* info = instruction pc */
  31   VRELOCABLE,   /* info = instruction pc */
  32   VNONRELOC,    /* info = result register */
  33   VCALL         /* info = result register */
  34 } expkind;
  35
  36 typedef struct expdesc {
  37   expkind k;
  38   int info, aux;
  39   int t;  /* patch list of `exit when true' */
  40   int f;  /* patch list of `exit when false' */
  41 } expdesc;
  42
  43
  44 struct BlockCnt;  /* defined in lparser.c */
  45
  46
  47 /* state needed to generate code for a given function */
  48 typedef struct FuncState {
  49   Proto *f;  /* current function header */
  50   Table *h;  /* table to find (and reuse) elements in `k' */
  51   struct FuncState *prev;  /* enclosing function */
  52   struct LexState *ls;  /* lexical state */
  53   struct lua_State *L;  /* copy of the Lua state */
  54   struct BlockCnt *bl;  /* chain of current blocks */
  55   int pc;  /* next position to code (equivalent to `ncode') */
  56   int lasttarget;   /* `pc' of last `jump target' */
  57   int jpc;  /* list of pending jumps to `pc' */
  58   int freereg;  /* first free register */
  59   int nk;  /* number of elements in `k' */
  60   int np;  /* number of elements in `p' */
  61   int nlocvars;  /* number of elements in `locvars' */
  62   int nactvar;  /* number of active local variables */
  63   expdesc upvalues[MAXUPVALUES];  /* upvalues */
  64   int actvar[MAXVARS];  /* declared-variable stack */
  65 } FuncState;
  66
  67
  68 Proto *luaY_parser (lua_State *L, ZIO *z, Mbuffer *buff);
  69
  70
  71 #endif